Smokeless furnace.



. 1.. 9 H a m m y, m.. .3 M (.l M mm mi mr m N .wm J n@ m Hmm. wk n@ S mNIMXWBNI w CARL JOHAN oBEEG, or sALT LAKE CITY, UTAH;

sMoKELEss FUBNACE.

Specification of Letters P atent.

Patented Apn'i 28, 190s.

Application filed July 8, 1907. Serial No. 382,805.

To all whom it may concern:

Be it known that I, CARL JOHAN OBERG, acitizen of the United States,residing at Salt Lake City, in the county of Salt Lake and State ofUtah, have invented certain new and useful Improvements in SmokelessFurnaces, of which the following is a specification. e l

This invention relates to steam boiler furnaces.

One object of the invention is to provide a furnace embodying suchvcharacteristics that perfect combustion may be obtained to precombustionchamber ,of the ire box, whereby f when one side of the fire box ischarged with fresh fuel, the products from such side will pass into thesupplemental combustion chamber through one of the aforesaid coursesslowly as com ared with the products from the main combustion chamberthrough the other horizontal course, incident to the diHerence intemperature occasioned by the fresh supply of fuel, the products rfromthe different courses uniting in the supplemental combustion chamberwhere they are consumed to such an extent as to insure against the.issuance of heavy volumes of smoke from the chimney or stack.

With the above and other vobjects in view, the present `inventionconsists in the combination and arrangement of parts' hereinafter morefully described, illustrated in the accompanying drawings, andparticularly pointed out in the appended claims, it being understoodthat changesA may be made in the form, size, proportion, and minor"details within the scope of they appended claims, without departing fromthe s irit or sacriicing any of the advantages t ereof.-v

In the drawingsz--Figure 1 is a longitudinall sectional view of a steamboiler furnace lof the grate.

gases,

tical sectional View on the line a--a of Fig. 1.

Fig. 4 is a transverse vertical sectional view on the line b--b of Fig.2.

Referring now more particularly to the accompanying drawings, thereference character 1 indicates the supporting structure ofbrick,.masonry, or other suitable material in which the tubular boiler 2is located, the boiler having the` usual steam dome 3 and heads 4 with afeed pipe 5 leading from the rear end of the structure immediatelybeneath the cleaning opening 6 and thence u ward into the boiler. Theboiler has t e usual front smoke arch 7 and a communicating smoke flue8, and is preferably supported in position by the front wall of theouter structure 1, the bridge wall 9, and the rear wall 10 of thecombustion chamber 11, or in any other suitable manner.

The character 12 indicates a grate of any suitable character supportedbetween the front of the structure and the bridge wall'9 in any suitablemanner, the drawings indicating that the -front wall and the bridge wallare cutaway to provide shoulders for the support Access is had to the rebox 13' above the grate through the spaced doors 14, while access is hadto the ash-pit 15 through one or more doors 16.

' The supplemental combustion chamber 1 1, which is of a comparativelylarge area to insure a lproper combustion of the carbon and ascommunication with the fire box through three separate and distinctpassages.

One passage is indicated at 17 and extends through the bridge wall 9near its upper edge and intermediate the sides thereof and is designedto carry 0H the hotter gases of the furnace as the latter is beingfired, these hotter gases being utilized to accelerate the combustion inthe chamber 11, as Ihereafter explained. Each side wall of the fire boxisprovided with a recess indicated respectively at 18 and 19, while eachside of the supplemental combustion chamber 11A is provided with arecess indicated res ectively at 2O and 21, the recesses of the fire oxand of the supplemental combustion chamber are within the sides of theouter wall of the structure 1 and communicates through passage ways 22around the ends of the bridge wall 9. Thus hot gases and smoke may passinto the su plemental combustion chamber at both t e right and left handsides of the furnace, or around the ends of the bridgewall.

The rear wall 10 of the supplemental combustion chamber 11 is providedwith a series of openings 23 through which the final products of thecombustion pass toward the rear of the structure and thence u wardly andforwardly through the boiler ffiies, and thence out through the chimneyor stack 8 as indicated by arrows in Fig.

In operating my invention one side of the fire box is preferably firedat a time. When the firing is done on the left side of the furnace orthrough the left hand door 14 the products of combustion pass throughthe passage ways 19-21 and the connecting passages 22 at the left sideto the supplemental combustion chamber where they will mix with theproducts issuing through the intermediate passage 17.

When the firing is done on the right side of the furnace, or through theright hand fire door 14, the products of the combustion pass through thepassage 18--19 and the connecting passages 22 at the left and thusinsure a thorough intermingling and complete combustion rior to thepassage of the fumes to the stacif 8 through the openings 23 in the rearwall 10 of the supplemental combustion chamber. By this arrangement itwill be obvious that when the firing is being done through the left handdoor, the opening of the door will necessarily retard or check thecombustion, and the combustion upon the opposite side of the furnacewill proceed more rapidly, and then when the left hand door is closedand the firing done through the right hand door, the action will bereversed, or the combustion be greatest upon the left hand side of thefurnace and checked at the right hand side, consequently the combustionwill proceed alternately through the side passages 18-20 and 19-21. Bythis arrangement of' feeding the fuel at alternate sides of the firechamber, the combustion is more uniform and is continuous, and is nottherefore interfered with by the opening and closing of the fire doors,as will be obvious.

From the foregoing it will be seen that I do not depend upon a supply ofheated air to insure a thorough mixing of the gases to make the propercombustion, but that on the other hand I eliminate the necessity ofsupplying air to the combustion chamber through a separate air supplyingmeans. It will be seen that the bottoms of the passage ways 22 areinclined and that the recesses 20 and 21 in the sides of thesupplemental combustion chamber are larger than the recesses 18 and 19of the hre box, to prevent clogging of the products of combustion intheir passage from the re box to the supplemental combustion chamber,and to insure a proper precipitation of the products into the same. Itwill also be seen that I provide a large supplemental combustion chamberto insure a thorough mixing and dissipation of the gases and carbonbefore the passage of the gases and carbon through the openings in therear wall of the supplemental combustion chamber. It will also be seenthat the alternate firing of the furnace or grate insured a perfectopera tion of the furnace in that when the left side of the furnace isreceiving a new charge of fuel, the smoke or carbon of that side willmeet the hot gases coming through the llues or passages on the rightside of the furnace. The large area of highly heated 'lire brick, fui'-nace flues and supplemental comlnistion chamber with which the productscome into contact makes the combustion complete without any extraadmission of air. It will also be noted that the products of combustionproceed directly from the grate 11 into the passages 16-1S15 and in asubstantially horizontal direction and enter the supplemental combustionchamber at the sides thereof and are directed against and commingledwith the products of the combustion passing through the intermediateaperture 17 of the bridge wall, the passages thus offering the minimumof resistance to the flame, smoke, gases, etc. passing therethrough.

What is claimed is 1. In a furnace, a main combustion chamber, a bridgewall provided with an intermediate transverse opening, a supplementalcombustion chamber having spaced side walls and a rear Wall, the rearwall provided with transverse openings, passage ways in the side wallsproviding substantially horizontal independent and direct means ofcommunication between the main combustion chamber and supplementalcombustion chamber.

2. In a furnace, a main combustion chamber, a supplemental combustionchamber, a bridge wall between the chambers, said bridge wall having anintermediate transverse aperture providing communication between thechambers and a supplemental chamber having transverse apertures in itsrear wall, and passage ways providing substantially horizontalcommunication between the chambers around the ends of the bridge wall.

8. In a furnace, an inclosing structure including side walls and with asmoke arch at one end and a main combustion chamber at the other end, asupplemental combustion chamber between the smoke arch and the maincombustion chamber, a bridge wall between the main combustion chamberand supplemental combustion chamber and hav- V means of communicationbetween said main chamber and supplemental chamber around the end of thebridge wall, and a wall be- .tween the supplemental chamber and smokearch and provided with a plurality of transverse apertures providingcommunication between the supplemental chamber and the smoke arch. f

4. In a furnace, an inclosing structure including sidewalls and with asmoke arch at one end and a main combustion chamber at the other endwith spaced feed openings provided with movable doors next the sidewalls of the main combustion chamber, a supple-v mental combustionchamber between the smoke arch and the main combustion chamber, a bridgewall between the main combustion chamber and supplemental combustionchamber and having an intermediate -communicating aperture, passageswithin said side walls providing independent substantially lhorizontalmeans of communication between said main chamber and supplementalchamber around the end of the bridge wall, and a wall between thesupplemental chamber and smoke arch and-provided with a plurality oftransverse apertures providing communication between the supplementalchamber and the smoke arch, whereby the fuel may be fed alternatelyTthrough said doors to the main combustion chamber at the opposite sidesthereof and the products of combustion conducted into the supplementalcombustion chamber alternately at opposite sides.

In testimony whereof I affix my signature, in presence of two witnesses.

CARL JOHAN OBERG.

Witnesses:

CHARLE F. CHRrsTENsEN, NICHOLAS GULBRANSEN.

